US4054291A - Turntable assembly for phonograph records - Google Patents

Turntable assembly for phonograph records Download PDF

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Publication number
US4054291A
US4054291A US05/566,537 US56653775A US4054291A US 4054291 A US4054291 A US 4054291A US 56653775 A US56653775 A US 56653775A US 4054291 A US4054291 A US 4054291A
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United States
Prior art keywords
record
turntable
support means
phonograph
defining
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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US05/566,537
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English (en)
Inventor
Keijiro Maeda
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Sony Corp
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Sony Corp
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    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B19/00—Driving, starting, stopping record carriers not specifically of filamentary or web form, or of supports therefor; Control thereof; Control of operating function ; Driving both disc and head
    • G11B19/20—Driving; Starting; Stopping; Control thereof
    • G11B19/2009—Turntables, hubs and motors for disk drives; Mounting of motors in the drive

Definitions

  • This invention relates generally to a turntable assembly for phonograph records, and more particularly is directed to improvements in the means by which the phonograph records are supported on the rotatable turntable of a phonograph record player.
  • Phonograph pickup cartridges are being continuously improved by being made lighter in weight and capable of playing or reproducing phonograph records with decreased vertical contact pressures of the stylus in the record groove.
  • cartridges are presently available that can play phonograph records quite well with a vertical contact force of only one-half gram, and it is anticipated that, in the near future, cartridges will be available to play phonograph records with a vertical contact force of only about one-tenth gram.
  • phonograph records are made of plastic materials which deform under continuous stress and exposure to elevated temperatures, such phonograph records may become distorted or warped either by reason of improper manufacture or because they are not stored under ideal conditions.
  • a warped or distorted phonograph record is placed on an existing turntable, the undersurface of the record does not contact the surface of the turntable over its entire area so that gaps or spaces are left between the record and turntable with the result that the record is at least partly in a floating or unstable condition.
  • the tracking of the needle or stylus of the cartridge in the record groove and generates considerable forces which react on the phonograph record.
  • Another object is to provide a phonograph record turntable assembly which is capable of close supporting contact with a phonograph record even though the latter is substantially warped or deformed from a flat plane.
  • a further object is to provide a phonograph record turntable assembly, as aforesaid, which is effective to damp vibrations generated by a drive source for the turntable or resulting from external shocks or impacts to which the turntable or its supporting cabinet may be subjected, so that such vibrations are not transmitted to a phonograph record supported on the turntable and the inclusion of resulting noises in the reproduced signals is avoided.
  • the turntable of a phonograph record player is provided, on its upper surface, with a plurality of elastically flexible record support members which are preferably upwardly dished so as to be engageable at their peripheries with the undersurface of a phonograph record even if the latter is substantially warped, whereby to uniformly support the record on the turntable.
  • each record support member and the portion of the record engaged therewith define an enclosed space therebetween which opens to the atmosphere through at least one air passage in the record support member, so that the viscous resistance to air flow through each such passage is effective to damp any vibrations that might otherwise be transmitted to the phonograph record.
  • FIG. 1 is a perspective view of a phonograph record player provided with a turntable assembly for phonograph records according to one embodiment of this invention
  • FIG. 2 is a plan view of the turntable assembly shown on FIG. 1;
  • FIG. 3 is an enlarged, fragmentary cross-sectional view taken along the line III--III on FIG. 2;
  • FIG. 4 is an enlarged partial cross-sectional view of the turntable assembly shown on FIG. 1, with a phonograph record being shown mounted on the turntable assembly;
  • FIG. 5 is an enlarged cross-sectional view similar to that of FIG. 3, but showing a record support member according to another embodiment of this invention
  • FIG. 6 is a plan view of the record support member shown on FIG. 5;
  • FIG. 7 is an enlarged cross-sectional view similar to that of FIG. 3, but showing a record support member according to still another embodiment of this invention.
  • FIG. 8 is an enlarged cross-sectional view similar to that of FIG. 4, but showing a turntable assembly according to a further embodiment of this invention.
  • FIG. 9 is an enlarged cross-sectional view of a turntable assembly for phonograph records according to a still further embodiment of this invention.
  • a phonograph record player 10 which, as is usual, generally comprises a cabinet 11 containing a drive mechanism (not shown) for a turntable assembly 102 rotatably mounted on the cabinet, and a tone arm assembly 13 for reproducing signals recorded on a phonograph record (not shown) when the latter is rotatably supported on turntable assembly 12.
  • the tone arm assembly 13 is shown to comprise the usual tone arm 13b which is swingably mounted on cabinet 11 by way of a shaft 13a, and which carries a cartridge 13c at its free end.
  • the turntable assembly 12 comprises the usual circular turntable 12a of aluminum or any other suitable material which is rotatable about a centrally located spindle 14, and which, in accordance with this invention, is provided, on its upper surface, with a plurality of elastically flexible record support means 15a and 15b for supporting a phonograph record on turntable 12a.
  • Such record support means 15a and 15b are each adapted to cooperate with the undersurface of a phonograph record supported thereon for defining an enclosed space therebetween, and each record support means is further formed to define at least one air passage through which such enclosed space communicates with the atmosphere.
  • the elastically flexible record support means 15a and 15b may be constituted by circular, upwardly dished record support members of relatively larger and smaller diameters, respectively, and are arranged in outer and inner circular arrays, respectively, which are concentric with a central hole 21 (FIG. 2) provided in turntable 12a for receiving spindle 14.
  • the record support members 15b of the inner circular array are preferably staggered, in the circumferential direction of turntable 12a, relative to the record support members 15a of the outer circular array.
  • each of the upwardly dished record support members 15a formed, for example, of natural or synthetic rubber or any other suitably elastically flexible material, may include a relatively thick, central lower portion 16a and a relatively thin, raised peripheral portion flaring upwardly from central portion 16a so as to provide member 15a with a configuration similar to that of a suction cup.
  • the lower portion 16a of each record support member 15a is suitably secured to turntable 12a so that the peripheral portion 17a will extend upwardly from the latter.
  • the upper surface of turntable 12a may be formed with a circular recess 12b for each record support member 15a with each circular recess 12b being diametrically dimensioned so that lower central portion 16a of the respective record support member can be fitted therein under compression and thereafter frictionally retained within recess 12b.
  • the central lower portion 16a of each record support member 15a may be secured on turntable 12a by adhesive or by a screw (not shown) extending through portion 16a into the turntable.
  • annular groove 18a is preferably formed in the upwardly facing surface of each record support member 15a adjacent the root of its peripheral portion 17a so as to increase the compliance or flexibility of such peripheral portion. Further, at least one bore 19a extends axially through central lower portion 16a and communicates with a hole 20a opening from the bottom of recess 12b to the undersurface of turntable 12a.
  • each of the record support members 15b may be identical to the previously described record member 15a, with the exception of its diametrical dimensions, and has its several parts identified by the same reference numerals used in the above description of record support member 15a, but with the reference letter "b" appended thereto.
  • the undersurface of such record is engaged and supported by the peripheral portions 17a and 17b of the elastically flexible record support members 15a and 15b. Since the compliance or elastic flexibility or peripheral portions 17a and 17b is relatively great, the weight of phonograph record 22 causes such peripheral portions 17a and 17b to spread out so that, even if phonograph record 22 is warped, for example, has a portion of its outer periphery distorted upwardly by a distance a from the plane of the remainder of the record, the several record support members 15a and 15b are suitably deformed for ensuring contact of all of the record support members 15a and 15b with the undersurface of the phonograph record. Accordingly, the phonograph record is mounted in a stable manner on turntable assembly 12, with an enclosed space b being defined between each of the record support members 15a and 15b and the respective portion of the undersurface of record 22.
  • vibrations are generated in phonograph record 22 in response to the rotation of turntable 12a and the reproduction of signals from the record 22 by cartridge 13c, such vibrations are partly absorbed by the cushioning effect of the elastically flexible peripheral portions 17a and 17b of record support members 15a and 15b. Further, such vibrations tend to increase and decrease the volumes of the enclosed spaces b with the result that air tends to flow into and out of such enclosed spaces through the respective air passages defined by bore 19a and hole 20a and by bore 19b and hole 20b, respectively. It is to be noted that the viscous resistance to the flow of air in such air passages is proportional to the velocity of the air flow.
  • the resonance frequency of the phonograph record 22 at which the latter would be induced to vibrate by reason of the force exerted by cartridge 13c on the record during a reproducing operation is very high. Therefore, such vibration of the phonograph record at its resonance frequency while in close contact with record support members 15a and 15b would tend to cause correspondingly high frequency changes in the volumes of the enclosed spaces b.
  • Such high frequency changes in the volumes of spaces b result in very high velocity air flows in the respective air passages, so that large viscous resistance is encountered for damping the vibration of record 22 at its resonance frequency. Therefore, vertical vibrations of the phonograph record 22 are avoided, and cartridge 13c picks up only vibrations corresponding to the sounds recorded on the phonograph record.
  • the foregoing is particularly important in the case of stereophonograph records, as it ensures that the recorded right-hand and left-hand signals can be effectively separated.
  • a record support member 25 may be similar to the previously described record support member 15a and similarly formed with a central lower portion 26 which is pressed into the respective recess 12b of turntable 12a, and a relatively raised peripheral portion 27 which flares upwardly from central portion 26.
  • Such flaring peripheral portion 27 is again formed with an annular groove 28 adjacent its root and, in this case, air passages are defined by radial grooves 29 formed in the upper surface of peripheral portion 27 and extending outwardly from annular groove 28 to the edge of peripheral portion 27.
  • each record support member 25 functions in the same manner as described above with reference to the record support members 15a and 15b so as to compliantly contact the undersurface of the phonograph record even though the latter may be warped, and further to define an enclosed space between its flaring peripheral portion 27 and the portion of the undersurface of the phonograph record within the edge of such peripheral portion 27.
  • Such enclosed space then communicates with the atmosphere through the radial grooves 29 or air passages within which there is large viscous resistance to high velocity air flow for damping any vertical vibration of the phonograph record at its resonance frequency.
  • an elastically flexible record support member 35 is also generally similar to the previously described record support member 15a, and hence is provided with a relatively thick central lower portion 36 frictionally secured in the respective circular recess 12b of turntable 12a, and a relatively thin peripheral portion 37 which flares upwardly from central lower portion 36.
  • the flaring peripheral portion 37 of record support member 35 has an annular groove 38 in its upper surface adjacent the root of peripheral portion 37.
  • at least one air passage is defined by a perforation or bore extending outwardly from annular groove 38 through peripheral portion 37 so as to open at the downwardly facing surface of peripheral portion 37 above turntable 12a.
  • record support members 15a, 15b, 25 or 35 have been individually mounted in respective recesses 12b opening at the upper surface of turntable 12a.
  • record support members may be formed integrally with a circular mat which is merely placed upon, or otherwise secured to the upper surface of the turntable.
  • record support members 45a and 45b which are generally similar to the record support member 35 of FIG. 7, may have their respective relatively thick central lower portions 46a and 46b formed as integral parts of a circular rubber mat 40, while their respective flaring peripheral portions 47a and 47b extend upwardly and outwardly from such central lower portions 46a and 46b.
  • the flaring peripheral portions 47a and 47b have annular grooves 48a and 48b, respectively, in their upper surfaces, and air passages are provided by perforations 49a and 49b extending radially outward from annular grooves 48a and 48b through peripheral portions 47a and 47b, respectively, so as to open at the downwardly facing surfaces of such peripheral portions above mat 40.
  • the record support members 45a and 45b are disposed on mat 40 in arrays similar to those of the record support members 15a and 15b, respectively, on FIGS. 1 and 2, so as to be capable of fully supporting a phonograph record 22, even though the latter is warped, as shown on FIG. 8.
  • the air passages 49a and 49b extend radially outward through the respective peripheral portions of the record support members in the embodiment shown on FIG. 8, it will be apparent that the record support members integral with mat 40 may alternatively be of the type described above with reference to FIGS. 5 and 6, that is, record support members having radially extending grooves in their upper surfaces which open to the atmosphere at the edges of the respective record members.
  • the turntable 12a of a turntable assembly 12 may be provided with a depending circular flange 12c which is adapted to be engaged by a belt 51 for driving the turntable from a drive motor (not shown).
  • a drive motor not shown
  • the engagement of drive belt 51 about depending flange 12c presents a problem, as such engagement has to be effected after turntable 12a has been installed on spindle 14, at which time only small clearance exists between the skirt extending along the outer periphery of the turntable and the top surface or deck of cabinet 11 on FIG. 1. Therefore, in accordance with this invention, one or more of the recesses 12b of FIGS.
  • FIG. 9 shows the record support member associated with hole 50 to be of the type shown on FIGS. 3 and 4, it will be apparent that such record support member may be of the types indicated at 25 and 35 on FIGS. 5 and 7, respectively.

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  • Holding Or Fastening Of Disk On Rotational Shaft (AREA)
US05/566,537 1974-04-16 1975-04-08 Turntable assembly for phonograph records Expired - Lifetime US4054291A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP1974043404U JPS5341373Y2 (US20020051482A1-20020502-M00012.png) 1974-04-16 1974-04-16
JA49-43404[U] 1974-04-16

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US4054291A true US4054291A (en) 1977-10-18

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US (1) US4054291A (US20020051482A1-20020502-M00012.png)
JP (1) JPS5341373Y2 (US20020051482A1-20020502-M00012.png)
CA (1) CA1038301A (US20020051482A1-20020502-M00012.png)
DE (1) DE2515752C3 (US20020051482A1-20020502-M00012.png)
FR (1) FR2268327B1 (US20020051482A1-20020502-M00012.png)
GB (1) GB1489505A (US20020051482A1-20020502-M00012.png)
IT (1) IT1037386B (US20020051482A1-20020502-M00012.png)
NL (1) NL7504539A (US20020051482A1-20020502-M00012.png)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4234195A (en) * 1978-03-24 1980-11-18 Victor Company Of Japan Ltd. Apparatuses for reproducing signals from rotary recording mediums
US4499514A (en) * 1981-03-31 1985-02-12 Olympus Optical Co., Ltd. Disc drive apparatus
US4532623A (en) * 1984-03-19 1985-07-30 Rca Corporation Apparatus and method for reducing shock and vibration caused by cartridge loading
US4918678A (en) * 1977-12-12 1990-04-17 Dolby Ray Milton Disc reproducing system for compensating mechanical imperfections
US4985884A (en) * 1987-11-02 1991-01-15 Mitsubishi Denki Kabushiki Kaisha Disk shaped recording reproduction device
US5573126A (en) * 1994-11-02 1996-11-12 Amsted Industries Incorporated Gravity wedge for a slackless railcar connector assembly
US5809002A (en) * 1995-03-30 1998-09-15 Pioneer Electronic Corporation Disk clamping unit with a plurality of particles in a synthetic resin coating formed on either the clamper or the disk table
US5995480A (en) * 1996-01-09 1999-11-30 Matsushita Electric Industrial Co., Ltd. Rotary driving device having a surface vibration absorber part with a varying thickness
USD433011S (en) * 1999-05-26 2000-10-31 Numark Industries, Llc Disc jockey turntable
US20080148922A1 (en) * 2006-12-20 2008-06-26 Robert Morra Digital turntable scratch interface
US20110139539A1 (en) * 2009-12-15 2011-06-16 Electronics And Telecommunications Research Institute Structure for reducing acoustic load
US20130111507A1 (en) * 2011-02-15 2013-05-02 Panasonic Corporation Turntable

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0081001A1 (en) * 1981-12-04 1983-06-15 Lux Corporation Record player
ITUA20163561A1 (it) * 2016-05-18 2017-11-18 Almag Spa Metodo per la realizzazione di una billetta di ottone senza piombo o a basso contenuto di piombo e billetta così ottenuta

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US778492A (en) * 1902-03-14 1904-12-27 Victor Talking Machine Co Turn-table for talking-machines.
US1480629A (en) * 1921-09-29 1924-01-15 James G Nolen Yieldable support for phonograph records
US1917633A (en) * 1930-05-19 1933-07-11 Robert C Burt Nonvibratory support of record table
US3231454A (en) * 1961-04-14 1966-01-25 Cadillac Products Cushioning material
US3720415A (en) * 1970-06-08 1973-03-13 Mattel Inc Disc drive
US3831923A (en) * 1973-01-12 1974-08-27 Ace Controls Noise preventing shock absorber

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US778492A (en) * 1902-03-14 1904-12-27 Victor Talking Machine Co Turn-table for talking-machines.
US1480629A (en) * 1921-09-29 1924-01-15 James G Nolen Yieldable support for phonograph records
US1917633A (en) * 1930-05-19 1933-07-11 Robert C Burt Nonvibratory support of record table
US3231454A (en) * 1961-04-14 1966-01-25 Cadillac Products Cushioning material
US3720415A (en) * 1970-06-08 1973-03-13 Mattel Inc Disc drive
US3831923A (en) * 1973-01-12 1974-08-27 Ace Controls Noise preventing shock absorber

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4918678A (en) * 1977-12-12 1990-04-17 Dolby Ray Milton Disc reproducing system for compensating mechanical imperfections
US4234195A (en) * 1978-03-24 1980-11-18 Victor Company Of Japan Ltd. Apparatuses for reproducing signals from rotary recording mediums
US4499514A (en) * 1981-03-31 1985-02-12 Olympus Optical Co., Ltd. Disc drive apparatus
US4532623A (en) * 1984-03-19 1985-07-30 Rca Corporation Apparatus and method for reducing shock and vibration caused by cartridge loading
US4985884A (en) * 1987-11-02 1991-01-15 Mitsubishi Denki Kabushiki Kaisha Disk shaped recording reproduction device
US5573126A (en) * 1994-11-02 1996-11-12 Amsted Industries Incorporated Gravity wedge for a slackless railcar connector assembly
US5809002A (en) * 1995-03-30 1998-09-15 Pioneer Electronic Corporation Disk clamping unit with a plurality of particles in a synthetic resin coating formed on either the clamper or the disk table
US5995480A (en) * 1996-01-09 1999-11-30 Matsushita Electric Industrial Co., Ltd. Rotary driving device having a surface vibration absorber part with a varying thickness
USD433011S (en) * 1999-05-26 2000-10-31 Numark Industries, Llc Disc jockey turntable
US20080148922A1 (en) * 2006-12-20 2008-06-26 Robert Morra Digital turntable scratch interface
US20110139539A1 (en) * 2009-12-15 2011-06-16 Electronics And Telecommunications Research Institute Structure for reducing acoustic load
US20130111507A1 (en) * 2011-02-15 2013-05-02 Panasonic Corporation Turntable
US8752080B2 (en) * 2011-02-15 2014-06-10 Panasonic Corporation Turntable having elastic layer with high contact pressure portion

Also Published As

Publication number Publication date
GB1489505A (en) 1977-10-19
DE2515752C3 (de) 1979-10-18
NL7504539A (nl) 1975-10-20
IT1037386B (it) 1979-11-10
FR2268327A1 (US20020051482A1-20020502-M00012.png) 1975-11-14
AU7988675A (en) 1976-10-14
DE2515752B2 (US20020051482A1-20020502-M00012.png) 1979-02-15
JPS50133103U (US20020051482A1-20020502-M00012.png) 1975-11-01
FR2268327B1 (US20020051482A1-20020502-M00012.png) 1981-05-29
DE2515752A1 (de) 1975-10-30
CA1038301A (en) 1978-09-12
JPS5341373Y2 (US20020051482A1-20020502-M00012.png) 1978-10-05

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